Here are regulations for ADUs in Oregon, specifically Portland, Eugene, and Ashland:
http://www.deq.state.or.us/lq/sw/wasteprevention/greenbuilding.htm#current
Here are regulations for ADUs in Oregon, specifically Portland, Eugene, and Ashland:
http://www.deq.state.or.us/lq/sw/wasteprevention/greenbuilding.htm#current